Stereoscopic viewer



July 5, 1938.

M. KAHN STEREQSCOPIC VIEWER Filed April 12, 1957 INVENTOR.

U n u U M U .U U U .U H H U H U n U n U H U H U H U .n U n U H 3 U H U n U H U H A U n U n U n U n C U n U n U n U n B U n m H U n A U n U 7 BY M22072 Kaizn,

" Patented July-5, i938 UNITED STATES PATENT orrlcs mmiiiiiim Milton Kalm, New York, N. Y. Application April 12, 1937, Serial No. 138,372 4 Claims. (Cl. 88-31) This invention relates to hand-held stereoscopic viewers of the type wherein there is utilized a perforated film tape having therealong a series of pairs of stereoscopic images. The viewing device embodies a pair of binoculars and windows, and the film is threaded through the device to bring said images in registry with the windows.

One of the objects of the invention is to provide a simplified, economically manufacturabie m and salable, emciently' utilizable and operable, and improved device wherewith to view the stereoscopic pictures upon a film tape.

Another object is to provide a device of .the above type having simplified and improved means is for propelling and resting said film tape while viewing the pictures.

A further object is to provide a simplified de vice of the said type with improved means for positively registering the complementary pairs 20 of the images with said windows.

other objects and advantages will hereinafter appear. I

In the accompg drawing,

Fig. 1 shows a longitudinal cross-sectional ele 25 vation of the stereoscopic viewer of this invention.

Fig. 2 is a transverse-sectional elevation of the viewing device shown in Fig. i.

Fig. 3 is an interior plan view of the actuable 39 frame and guiding plate oi the viewing device.

Fig. 4 is an exterior plan view of the fllm guidlng plate.

Figs. 5, 6 are longitudinal cross-sectional eleva 35 tions showing portions of the film actuating frame and guiding plate illustrated in Fig. 3.

Fig. 'l is a plan view of a stereoscopic image film utilized with this invention. The film I, Fig. '7, is preferably of standard 49 cinematic dimensions. with standard perforations 2, and has printed therealong in series a plurality of photographic complementary pairs of stereoscopic images A, B, C, etc., as shown. The view;- ing device 3 comprises a casing l configurated to 45 form binoculars I, and provided with teeth over which are sprung. by means of holes 1, the upright attaching walls I of a receivingand guiding plate 8 for said film, the said plate having a pair I of windows It registering with said binoculars 50 and carrying translucent light-dispersing panes l I. Between the plate 9 and the bottom edges I! of casing 4, and guided laterally by the platcwalls 8. is located a frame l3, comprising a. pair of windows ll that register with the windows ll, 55 astoppingplate ilatitsterminalmiimitingpmjection l6, and a tooth H, the plate l5 extending outwardly to form a finger-piece l8 wherewith to manipulate the frame 13 which is thus slidable longitudinally outwardly from the film-guiding plate 9, toward the right as viewed in the draw- -5 ing, and backwardly. The outward stroke of frame I! is limited by abutment of its projection I against the casing portion la, while its return or inward stroke is stopped by its plate l5 striking the exterior of casing-portion 4a, the said stroke being equal to the distance of two film images, as will be hereinafter shown. The film guiding plate 8 is provided at its terminal with an upwardly projecting tooth l9, which extends in a groove 28 of frame I! so as not to impede the 16 latter during its stroke.

The film i is threadable through the device 3, by its terminal 2! entering at end 22 and the film passing between the guiding plate 3 and frame It, and emanating at end 23 at the device, the fllm being usually in the curled condition shown in Fig. 1 and provided with a printed guiding line 24, Fig. 7. .When the film is thus initially threaded through the device. its line 24 is made to stop at its registry with the frameswall i5, and there- 25 upon the downwardly projecting tooth ll of frame 13 enters one of the perforations 2a of the film and thereby engages the latter. Simultaneously with this initial engagement of the film I, its leading complementary pair of images A--A became aligned with the windows l0, and the first stereoscopic picture of the film may be then viewed by the user through the binoculars 5. Upon now grasping the finger-piece I8 to therewith draw the frame i3 outwardly and then returning it inwardly the engaged film is "thereby propelled and the next complementary pair of images B-B are presented to view, and by actuating the frame 13 in this manner all of the pictures of the film may be viewed fully and eifectlvely. At the termination of the outward stroke of the frame I! and propulsion of the film the tooth ll of guiding plate I enters and engages a film-perforation 2b thereat, and upon return of the frame its tooth ll disengages from the pertooth IS similarly passes under theline ofperforations until engagement with a subsequent means for limiting the movement of said frameperforation: 2b.

The image areas are so arranged upon the film that between the units comprising each complementary pair thereof are located two similar areas belonging to different pairs of images, and

it is required that the film be advanced to a dis-' ments may be used without others.

Having thus described my invention, I claim:- 1. A hand held device for viewing in still state a series of stereoscopic images upon a perforated,

film tape, the device having a casing forming binoculars for said images, the device having a plate and a frame for receiving and guiding the film between them, said plate and frame having registering windows for the images, means onsaid plate to support saidframe for slidable movement inwardly into a position of registry of said windows and outwardly from the device,

to a stroke corresponding to the required extent of advancement of the film; said frame having a projection adapted to engage a perforation of the film to therewith advance the film when the frame is slid outwardly for obtention of the successive views thereof,'said plate having a projection adapted to engage a perforation of the film to arrest it when the frame is slid inwardly, means to limit the inward and outward movements of said frame, and a finger-piece wherewith to actuate said frame.

2. A hand held device for viewing in still state a series of stereoscopic images upon a perforated film tape, the device having a casing forming binoculars for' said images, the, device having a plate and a frame for receiving and guiding the film between them, said plate and frame having registering windows for the images, means on said plate to support said frame for slidable movementinwardly into a position of registry of said windows and outwardly from the device, means for limiting the movement of said frame to a stroke corresponding to the required extent of advancement of the film, and said frame havin a projection adapted toengage a perforation of the film to therewith advance the film when the frame is slid outwardly for obtention of the successive views thereof.

'3. A'hand held device for viewing in still state a series of stereoscopic images upon a perforated film tape, the device having a casing forming binoculars for said images, the device having a plate and a frame for receiving and guiding the film between them, said plate and frame having registering windows for the images, means-on said plate to support said frame for slidable movement inwardly into a position of registry of said windows and outwardly from the device, means for limiting the movement of said frame to a stroke corresponding to the required extent of advancement of the film, said frame having a projection adapted to engage a perforation of the fihnto therewith advance the film when the frame is slid outwardly for obtention of the successive views thereof, and said plate having a projection adapted to engage a perforation of the film to arrest it when the frame is slid inwardly.

4. A hand held device for viewing in still state a series of stereoscopic images upon a perforated film tape, the device having a casing forming binoculars for said images, the device having a plate and a frame for receiving and guiding the film between them, said plate and frame having registering windows for the images, means on said plate to support said frame for slidable movement inwardly into a position of registry of said windows and outwardly from the device, means for limiting the movement of said'frame to a stroke corresponding to the required extent of advancement of the film, said frame having a projection adapted to engage a perforation of the film to therewith advance the film when the frame is slid outwardly for obtention of the successive views thereof, said plate having a projection adapted to engage a. perforation of the film to arrest it when the frame is slid inwardly, and means to limit the inward and outward movements of the frame.

MILTON KAHN. 

